Message #494

From: Melinda Green <melinda@superliminal.com>
Subject: Re: [MC4D] Magic120Cell Realized
Date: Sun, 04 May 2008 23:02:45 -0700

The full scramble is certainly terrifying to behold. OTOH, a scramble
with only 5 random twists didn’t look at all hard. Easier in many ways
to the 3^4 since the odds of two random twists interacting with each
other are much smaller as the number of faces grows. I’ve even attached
my own solution file! I was actually surprised that any of the random
twists of my 5 scramble interacted at all. Did you try to ensure this
would happen? That would seem like a good idea. Was it supposed to beep
or something when I reached the solved state? I didn’t notice anything.
Just like with MC4D I find the challenge of backing out a small number
of random twists to be an educational challenge. Fun and satisfying too.

Here are some suggestions after my short time with the puzzle.
* Allow users to supply the number of random twists. Scramble->Custom
perhaps?
* Detect when a user’s click is the exact inverse of their previous one
and substitute an undo instead.
* Create the ability to move the front clipping plane in. I’m often
operating on a zoomed-in view of the central cell and often fight to get
clear views of it.
* I agree with Jenelle that the ghost piece highlighting is a cool
effect. Maybe you could use that effect for as long as ctrl-shift is
held down? That way there would be no need to cancel it.
* How about a method of doing the inverse? I.E. for any selected
sticker, highlight the one that belongs in its place.
* Add Help->About with your name, copyright, version number?

Lastly, where did you get your colors from for the full puzzle? It looks
fantastic!
-Melinda

Roice Nelson wrote:
> Honestly, the reason I wasn’t planning on working through a solution
> was that I am a bit scared of the sheer number of pieces! I just
> finished up the final parts that I felt were needed for it to be
> solvable today, and I actually haven’t even figured out a single
> sequence yet. So as of this evening, I only have the thoughts about
> it we’ve discussed in the past, which is that it will be easier in
> some ways than MC4D because of the larger space to sequester pieces,
> but that it will be a big effort in time. Also, I think I am ready
> for a bit of a rest and was too excited to share to let it sit on a
> shelf. Sarah will be happy to get my attention back now too since
> I’ve been spending a lot of time on it lately :)
>
> Since I haven’t been through it, I hope there are enough features for
> a solution (there are no macros yet, and I could see that being the
> first request as people start attacking it, but it will be a while
> before I look at that). I think my fear at this point is that some
> stupid bug would somehow corrupt someones solution after they worked
> on it for a long time! Working through MC5D myself was able to quell
> that worry last time. But the scrambling and autosolve has had a
> decent amount of exercise as I’ve worked on it, so I think all should
> be ok.
>
> Writing a general 4D puzzle engine certainly would be a huge
> achievement. It was nice to be able to hardcode 120 cell
> characteristics throughout the code, and I certainly did - I can’t
> imagine having worked without that luxury at this point. I also
> realized through this effort that I understood general 4D rotations
> very badly, and still do though I’ve improved a little. It was so
> much easier when everything was coordinate axis aligned. I was able
> to glean just enough from the results of a paper
> (http://www.geometrictools.com/Documentation/RotationsFromPowerSeries.pdf),
> which combined with some experimentation to figure out how to
> calculate the rotation matrix coefficients allowed me to get working
> code for "simple rotations". Wiki has some more info on that term if
> anyone is interested (http://en.wikipedia.org/wiki/SO%284%29).
>
> Anyway, I won’t go on too much for now, but I look forward to more
> discussion about this puzzle. Thank you so much for your highly
> positive email :)
>
> Roice

Magic120Cell Version1 4 0 44
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